KEF BD139 passive radiator specs?

Joschl · 29th December 2008, 09:24 AM

Hello folks,

I would like to use a pair of KEF BD139 (SP 1332 from 1993) passive radiators but I can not find the specs anywhere.
I just know that Sd = 349cm^2

But it would be nice to know Vas, Fs and Qms.
Anybody out there who has this information?

Kind regards and all the best for 2009.

Josch

Jonathan Bright · 29th December 2008, 09:52 AM

hi Josch. Probably your best hope is a Kef site in the UK. Just type in "hifiloudspeakers" into your search engine and the first site will probably be it. They only deal with KEF speakers and drive units. They should be able to help. <Merry Xmas. Jonathan

AndrewT · 29th December 2008, 09:52 AM

the datasheets are on KEF's website, as are all their DIY driver product range.

Joschl · 29th December 2008, 12:03 PM

Thank you for the information. When I tried to enter the site before it seemed to be a dead link but now it works.

How about measurement on passive radiator units?

Br
Josch

speakerdoctor · 29th December 2008, 02:03 PM

Checked the KEF site and couldn't find detail specs on their drivers.

I do know Seas publishes specs on their passive radiators. The specs include an invaluable chart showing helmoltz resonator freq. vs cabinet volume for various added weights. Something that comes in very handy for tuning your radiator.

Joschl · 29th December 2008, 02:20 PM

That is a good hint. Thank you. I think I will take the H9946 SP26R datasheet (same Sd), play a little bit with WinISD and the rest is trial and error

Br
Josch

Jonathan Bright · 29th December 2008, 07:31 PM

Sorry Josch my earlier post was confusing. "hifiloudspeakers" is a site devoted to KEF units but not an official Kef website. Have you tried it? There are contributions there on the passive radiator but not necessarily exactly what you want. Some guys from Germany have sent in material. They may be helpful to follow up. Good luck.

a.wayne · 30th December 2008, 12:47 AM

Are B139's still in production ?

Joschl · 30th December 2008, 07:48 AM

No prob. I recognized that before. Unfortunately the forum there seems to be some kind of dead and the search gave no results for "SP1332".
I will gather some material about designing loudspeakers with passive radiators and start with test box next year. Playing around with WinISD gave me an impression how the parameters of the BD139 will influence the frequency response.
Br
Josch

Joschl · 30th December 2008, 07:53 AM

As far as I know the B139 and any other diy product from KEF is no longer produced. My units are from 1993.
Br
Josch

29th December 2008, 09:24 AM	#1
Joschl diyAudio Member Join Date: Dec 2005 Location: Ruhrgebiet	KEF BD139 passive radiator specs? Hello folks, I would like to use a pair of KEF BD139 (SP 1332 from 1993) passive radiators but I can not find the specs anywhere. I just know that Sd = 349cm^2 But it would be nice to know Vas, Fs and Qms. Anybody out there who has this information? Kind regards and all the best for 2009. Josch

29th December 2008, 09:52 AM	#2
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	hi Josch. Probably your best hope is a Kef site in the UK. Just type in "hifiloudspeakers" into your search engine and the first site will probably be it. They only deal with KEF speakers and drive units. They should be able to help. <Merry Xmas. Jonathan __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

29th December 2008, 09:52 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	the datasheets are on KEF's website, as are all their DIY driver product range. __________________ regards Andrew T.

29th December 2008, 07:31 PM	#7
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	Sorry Josch my earlier post was confusing. "hifiloudspeakers" is a site devoted to KEF units but not an official Kef website. Have you tried it? There are contributions there on the passive radiator but not necessarily exactly what you want. Some guys from Germany have sent in material. They may be helpful to follow up. Good luck. __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

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29th December 2008, 12:03 PM	#4
Joschl diyAudio Member Join Date: Dec 2005 Location: Ruhrgebiet	Thank you for the information. When I tried to enter the site before it seemed to be a dead link but now it works. How about measurement on passive radiator units? Br Josch

29th December 2008, 02:03 PM	#5
speakerdoctor diyAudio Member Join Date: Sep 2006 Location: New England	Checked the KEF site and couldn't find detail specs on their drivers. I do know Seas publishes specs on their passive radiators. The specs include an invaluable chart showing helmoltz resonator freq. vs cabinet volume for various added weights. Something that comes in very handy for tuning your radiator.

29th December 2008, 02:20 PM	#6
Joschl diyAudio Member Join Date: Dec 2005 Location: Ruhrgebiet	That is a good hint. Thank you. I think I will take the H9946 SP26R datasheet (same Sd), play a little bit with WinISD and the rest is trial and error Br Josch

30th December 2008, 12:47 AM	#8
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Are B139's still in production ?

30th December 2008, 07:48 AM	#9
Joschl diyAudio Member Join Date: Dec 2005 Location: Ruhrgebiet	No prob. I recognized that before. Unfortunately the forum there seems to be some kind of dead and the search gave no results for "SP1332". I will gather some material about designing loudspeakers with passive radiators and start with test box next year. Playing around with WinISD gave me an impression how the parameters of the BD139 will influence the frequency response. Br Josch

30th December 2008, 07:53 AM	#10
Joschl diyAudio Member Join Date: Dec 2005 Location: Ruhrgebiet	As far as I know the B139 and any other diy product from KEF is no longer produced. My units are from 1993. Br Josch

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